Perth's Duplicate Image Problem: The Key Decisions That Will Define What Comes Next

Perth's rapid growth has generated an ungainly side effect: duplicate images are piling up across government land registries, real estate listing platforms and council planning portals at a rate that specialists say is straining data integrity systems built for a smaller city. The problem is not abstract. Strata titles lodged through Landgate, the WA government's land information authority, have been flagged internally for carrying duplicate or near-identical site photographs attached to separate lot records — a paperwork tangle that slows settlement and frustrates conveyancers working the already stretched Stirling, Joondalup and Armadale corridors.

The timing matters because WA is mid-cycle on two major programs that are generating enormous volumes of new imagery. The Metronet rail expansion — currently pushing forward on the Morley–Ellenbrook Line and the Yanchep Rail Extension — requires thousands of geospatial and site photographs at every planning, construction and compliance stage. Simultaneously, defence infrastructure investment tied to AUKUS and the build-up at HMAS Stirling on Garden Island is producing classified and unclassified imagery that flows into multiple Commonwealth and state repositories, each with its own deduplication protocols. When those systems talk to each other imperfectly, duplicates proliferate.

Where the Decisions Land

The immediate fork in the road sits with the Department of Planning, Lands and Heritage, which oversees Landgate and sets the data standards that flow down to local government. Three options are on the table within the sector. The first is a centralised hash-matching system — software that fingerprints every image at the point of upload and blocks a duplicate before it enters the record. The second is a retrospective audit, clearing existing duplicates from the archive before any new standard is imposed. The third, and most contentious, is delegating the problem to individual councils and asking them to run their own cleanup on a timeline they set themselves.

City of Perth planners working out of the Council House building on Hay Street have already been dealing with a version of this on a smaller scale, after the council's development application portal migrated to a new system in late 2024 and imported legacy records imperfectly. The City of Stirling, which processes one of the highest volumes of residential development applications in WA, faces a similar inherited backlog. Neither council has publicly confirmed a resolution date.

The stakes are financial. Property settlement in WA costs buyers a standard lodgement fee set by Landgate, and delays caused by duplicate or conflicting image records can push a settlement past its contractual deadline — triggering penalty interest that, on a median Perth house price now sitting above $780,000 according to Real Estate Institute of Western Australia data from early 2026, can run to hundreds of dollars a day.

What Industry Wants — and What Government Has Said

The Real Estate Institute of Western Australia and the Law Society of WA have both engaged the Department of Planning, Lands and Heritage through working groups over the past 18 months on broader data quality issues, of which duplicate imagery is one component. No formal policy response has been announced as of July 4, 2026.

For conveyancers on settlements scheduled through August and September — the period when the spring selling season traditionally kicks into gear in suburbs like Subiaco, Fremantle and the upper Swan Valley — the practical advice is blunt: lodge documents early, flag any image-reference discrepancy in the title search at first review rather than at the final check, and build an extra 48-hour buffer into settlement dates where the property has a recent strata plan or a subdivision completed after January 2023, when Metronet-adjacent rezoning activity spiked.

The department is expected to release updated data standards guidance before the end of the 2026 calendar year. Whether that guidance mandates a technical fix or simply recommends best practice will determine whether Perth's duplicate image backlog shrinks — or quietly doubles again by the time the Morley–Ellenbrook Line opens.